This document discusses how to build an interactive map using library catalog data. It explains what geocoding is and how to geocode catalog records by associating them with locations. It provides steps for creating a spreadsheet with country, value, and catalog record URL links. This spreadsheet can then be pasted into a geocoding software to generate an interactive map. Considerations for mapping include catalog coverage, legal terms of service, and political implications of how countries/languages are represented. Resources for geocoding and mapping are also provided.